Accelerator-free carboxylated latex compositions and articles

a technology of carboxylated latex and accelerator, applied in the field of accelerator-free carboxylated latex compositions and articles, can solve the problems of general inferior physical properties and heat resistance of articles cured with accelerators and sulfur only without polyvalent metal or metal oxides, and achieve the effect of reducing the type iv allergic contact dermatitis

Inactive Publication Date: 2006-03-16
AT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0004] An object of the invention is to provide carboxylated latex compositions which are free of organic rubber accelerators to eliminate Type IV allergic contact dermatitis induced by such accelerators.

Problems solved by technology

Articles cured with accelerators and sulfur only without polyvalent metal or metal oxides are generally inferior in physical properties and heat resistance.
However, these two cure systems have a common disadvantage in certain applications because organic accelerators may cause Type IV allergic contact dermatitis when the articles are used to contact with human skin or tissues.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0022] As shown in Table 1 below, a master batch of cross-linking complex dispersion was prepared by mixing together methoxymethyl methylol melamine (organic cross-linking agent), zinc oxide dispersion, and polymeric hindered phenol. The dispersion was allowed to age for at least 7 days at temperature between 10 to 30 degree C. before it was used to mix with other components of the composition.

TABLE 1Master Batch of Cross-linking Complex DispersionMethoxymethyl methylol melamine32.8%Zinc oxide16.4%Polymeric hindered phenol 6.8%Water (from dispersions & added)  44%

The % was in weight basis.

The solids content was 56%.

[0023] A carboxylated nitrle latex composition was prepared with the amount of each component shown in Table 2. All amounts are expressed in parts per hundred parts of dry nitrile rubber (phr).

TABLE 2Carboxylated nitrile latex (Nantex 630E)100phrPotassium hydroxide0.6phrTitanium dioxide2.8phrPhthalocyanine salt0.04phrTable 1: Master Batch of Cross-linking Complex2.0...

example 2

[0028] By eliminating the 0.4 phr additional zinc oxide in Table 2, the tensile property of the cured gloves is shown in Table 5 below.

TABLE 5Tensile strength27.9 MPa (4,046 PSI)300% modulus1.8 MPa (261 PSI) Ultimate elongation780%

[0029] The 300% modulus and ultimate elongation shown in Table 3 and Table 5 illustrate the significant effect of the ratio of alkoxyakyl akylol melamine to zinc oxide on softness of the cured gloves.

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PUM

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Abstract

Accelerator-free carboxylated latex compositions, articles made therefrom, and methods of fabricating them, are disclosed. The carboxylated latex compositions use a mixture of alkoxyalkyl alkylol melamine and zinc oxide as their cure system. Carboxylated nitrile (a terpolymer of butadiene, acrylonitrile and organic acid) gloves made according to this invention are free of accelerators and sulfur, and they have similar tensile property as nitrile gloves cured by accelerators, sulfur and zinc oxide. Furthermore, glove softness can be adjusted by varying the quantity ratio of alkoxyalkyl alkylol melamine to zinc oxide.

Description

THE BACKGROUND OF THE INVENTION [0001] The invention pertains to a crosslink (cure) system, such as an accelerator-free crosslink system particularly suited for carboxylated latex. The accelerator-free system comprises alkoxyalkyl alkylol melamine and metal oxide. The accelerator-free system can, for example, produce carboxylated nitrile latex films having high tensile strength up to over 5,000 psi (pounds per square inch) and 300% modulus below 1,000 psi that are comparable to nitrile latex films produced by conventional cure system comprising accelerators, sulfur and zinc oxide. [0002] There are two types of raw nitrile rubber: one is carboxylated and the other is non-carboxylated. Carboxylated nitrile is a terpolymer of butadiene, acrylonitrile, and organic acid while non-carboxylated nitrile is a copolymer of butadiene and acrylonitrile. [0003] Elastomeric nitrile rubber products are typically made from a composition containing a cross-linker. Cross-linking makes possible the cu...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B32B1/08B32B27/08
CPCA41D19/0062B29C41/003B29C41/14C08K5/3492C08L9/04Y10T428/1352C08L15/00C08L13/02Y10T428/139
Inventor HUANG, WUNAN
Owner AT TECH
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